Here are some select quotes.

Firefighting is a physically demanding occupation that may require 6,000 calories (kilocalories) per day. Firefighters who do not consume enough calories will become fatigued and lose body weight and muscle. Consuming too few calories over the weeks and months of a busy fire season can impair immune function and lead to illness. This is not the time to lose weight. Firefighters should check their weight every 2 weeks to monitor their energy balance. The best time to weigh is in the morning before breakfast (but after urination).

Carbohydrate Requirements

High levels of continuous physical activity, such as digging fireline for hours, increase the daily carbohydrate requirements. Each gram of carbohydrate provides 4 calories of energy.

The following example shows how to calculate the carbohydrate requirement for a 154-pound firefighter:

Weight (in pounds) 154/ (2.2 pounds/kilogram) = 70 (weight in kilograms)

Moderate Work—5 to 7 grams of carbohydrate/kilogram/ day x 70 kilograms (body weight) = 350 to 490 grams of carbohydrate/day

Hard Work—7 to 10 grams of carbohydrate/kilogram/ day x 70 kilograms (body weight) = 490 to 700 grams of carbohydrate/day

For ultraendurance activities or very hard work, such as a long, hard day on the fireline, the carbohydrate requirement could be even higher.

Protein

Athletes and wildland firefighters require 1.2 to 1.8 grams of protein per kilogram of body weight per day, with 1.2 grams required for moderate work and 1.8 grams required for prolonged hard work under adverse conditions. For this example, we will use a 154-pound (70-kilogram) firefighter who requires 1.5 grams of protein each day for each kilogram of body weight.

1.5 grams of protein/kilogram/day x 70 kilograms (body weight) = 105 grams (3.7 ounces) of protein/day.

Fat

Fat should provide no more than 20 to 35 percent of daily calories. No more than one-third of the fat should come from saturated and trans fats (such as butter, lard, dairy fat, and some processed fats—read the labels). The balance of fat should come from monounsaturated and polyunsaturated fats (such as olive, canola, and peanut oils or from nuts such as almonds, hazelnuts, and olives). If a firefighter needs 4,000 calories per day for heavy work, one-quarter can come from fat (1,000 calories). Because each gram of fat has 9 calories, that's 111 grams (4 ounces) of fat per day.

Say that 70 kg firefighter is working hard enough to need 6,000 calories a day. He probably needs 1.8 grams/kg of protein (126 grams and 504 calories). Fat can be 1,200 to 2,100 calories a day. So, approx 4300 - 3400 calories a day from carbs. 1,100 grams is possible if fat is kept on the low side.


Even their example 70kg firefighter with only 4,000 calories a day, 1,000 of which come from fat and 420 calories come from protein, that leaves 2,580 calories left or 645 grams of carbs each day.

And here is a recommended day of food from the instructor's guide.


I won't lie, a long deployment where this is the type of diet I will be fed scares me more than many of the other things most people would be afraid of.

Source: https://www.fs.fed.us/t-d/pubs/htmlpubs/htm06512833/page01.htm

Edit: I couldn't find the thing about the eggs and red meat. It must be in a different training. But, I swear it was part of it. Even here, 10 ounces or meat or meat-substitute is recommended. That's less than a third of what I eat right now!